Steerable device for accessing a target site and methods

ABSTRACT

A variety of steerable needles, lancets, trocars, stylets, cannulas and systems are provided for examining, diagnosing, treating, or removing tissue from a patient. The steerable needles, trocars, stylets, cannulas and systems also provide a platform for delivery of target materials, such as therapeutics, biologics, polymes, glues, etc., to a target site. An embodiment of the invention includes a steerable device for use in accessing target site in a patient comprising: a steerable member adapted to penetrate tissue; and a steering mechanism adapted to be operated by a user to apply a bending force to bend the steerable member to access the target site.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a Divisional of U.S. patent application Ser. No.14/814,349 filed Jul. 30, 2015 entitled “Steerable Device For AccessingA Target Site And Methods”, which is a Continuation of U.S. patentapplication Ser. No. 11/286,445 filed Nov. 23, 2005, now U.S. Pat. No.9,125,639, entitled “Steerable Device For Accessing A Target Site andMethods” which claims the benefit of U.S. Provisional Application No.60/630,803, filed Nov. 23, 2004, entitled “Steerable Biopsy NeedleApparatus and Method” (Mathis et al.), all of which are incorporatedherein by reference in their entirety.

U.S. patent application Ser. No. 11/286,445 filed Nov. 23, 2005,entitled “Steerable Device For Accessing A Target Site And Methods” alsoclaims the benefit of U.S. Provisional Application No. 60/666,746, filedMar. 29, 2005, entitled “Steerable Needle System”, which is alsoincorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

This invention relates generally to a design of devices and systems forsafely and effectively accessing tissue. The invention provides a deviceand system that can be easily steered through tissue within a patientfrom a location outside the patient's body. The system also provides aplatform for delivery of materials and devices to a target site oranatomic location within a body.

Description of Related Art

A variety of needles, lancets, trocars, stylets, cannulas, devices andsystems for examining, diagnosing, treating, or removing tissue from apatient are known in the art. See, U.S. Pat. No. 4,013,080 entitledCannula Connector and Director Indicator Means for Injection System(Froning); U.S. Pat. No. 4,769,017 entitled Self-Sealing InfusionManifold and Catheter Connector (Fath et al); U.S. Pat. No. 5,240,011entitled Motorized Biopsy Needle Positioner (Assa); U.S. Pat. No.5,526,821 entitled Biopsy Needle with Sample Retaining Means (Jamshidi);U.S. Pat. No. 5,660,185 entitled Image-Guided Biopsy Apparatus withEnhanced Imaging and Methods (Shmulewitz); U.S. Pat. No. 5,735,264entitled Motorized Mammographic Biopsy Apparatus (Siczek et al); U.S.Pat. No. 6,315,737 B1 entitled Biopsy Needle for a Biopsy Instrument(Skinner); U.S. Pat. No. 6,328,701 B1 entitled Biopsy Needle andSurgical Instrument (Terwilliger); U.S. Pat. No. 6,402,701 B1 entitledBiopsy Needle Instrument (Kaplan); U.S. Pat. No. 6,464,648 B1 entitledBiopsy Device and Remote Control Device Therefor (Nakamura); U.S. Pat.No. 6,485,436 B1 entitled Pressure-Assisted Biopsy Needle Apparatus andTechnique (Truckai et al); U.S. Pat. No. 6,558,337 B2 entitledPositioner for Medical Devices such as Biopsy Needles (Dvorak et al);U.S. Pat. No. 6,709,408 B2 entitled Dual Action Aspiration Biopsy Needle(Fisher); U.S. Pat. No. 6,908,440 B2 entitled Dual Action AspirationBiopsy Needle (Fisher); and U.S. Pat. No. 6,918,881 B2 entitled BiopsyNeedle with Integrated Guide Pin (Miller et al). U.S. PatentPublications US 2004/0133168 A1 entitled Steerable Needle (Salcudean etal.); as well as PCT Publications WO 00/13592 A1 entitled Device forReceiving and Actuating a Biopsy Needle (Heinrich); WO 03/077768 A1entitled Biopsy Needle and Biopsy Needle Module that Can be Insertedinto the Biopsy Device (Heske et al); WO 2004/062505 A1 entitledFlexible Biopsy Needle (Bates et al.); and WO 2004/086977 A1 entitledCoaxial Cannula Provided with a Sealing Element (Reske et al.).

For example, biopsy needles are used in the medical field to removetissue, cells or fluids from a body for examination and diagnostictesting. Biopsy needles can form part of a biopsy system. Currently,there are three main types of procedures that are used to obtain abiopsy, or tissue sample. First, a surgeon can use a scalpel, or othersuitable cutting instrument, to make an incision in a patient that islarge enough for the surgeon to access the tissue to be tested. One ormore large pieces of a target site, such as a tumor, lesion, cells orfluid, are then removed and tested for malignancy. This procedure istypically performed under general anesthesia.

Another technique, the core tissue biopsy procedure, uses a large boreneedle to cut or shear away one or more visible pieces of a tumor orlesion. The pieces of tissue obtained using a large bore needle arevisible to the unaided eye and may require further processing to viewthrough a microscope (i.e., due to the size and thickness of the tissuepieces obtained).

Yet another technique is the use of fine needle aspiration (FNA) needleswith small bores to obtain tissue samples. A needle is used with asyringe to access the target site. Negative pressure is created in thesyringe, and as a result of the pressure difference between the syringeand the mass, cellular material can be drawn into the syringe andremoved. Typically, the needle is moved in and out in order tofacilitate obtaining enough tissue or material to examine and make adiagnosis.

There are many medical conditions for which a physician might wish toobtain access to a target site or obtain a sample of tissue or materialfrom a patient. For example, pulmonary disorders affect millions ofAmericans, and many more individuals worldwide, each year. While somepulmonary disorders are chronic (e.g., chronic obstructive pulmonarydisease (COPD)), many are acute and deadly. For example, lung cancer isthe leading cause of death attributable to cancer for both men andwomen. More people die of lung cancer, than die of breast, prostate andcolon cancer combined. It is estimated that in the United States alone,over 170,000 new cases of lung cancer are diagnosed each year. Of thosepeople diagnosed with lung cancer, the prognosis is grim: 6 of 10 willdie within one year of being diagnosed and between 7 and 8 will diewithin two years of diagnosis.

Most lung cancers start in the lining of the bronchi (plural forbronchus), although lung cancer can start in other parts of the lung aswell. Since it generally takes many years for lung cancer to develop,there can be areas of pre-cancerous changes in the lung long before theformation of lung cancer. With currently available technology, thepre-cancerous changes are often not detected because the changes cannotbe seen on an x-ray and do not cause symptoms early on that would causea patient to seek medical attention. It is for this reason that mostpeople with lung cancer are not diagnosed during the critical earlystages of the disease.

Taking chest x-rays and checking sputum under a microscope for theappearance of cancer cells had been performed for screening but wasfound to be unreliable, and thus is not even recommended screening forpersons of high risk (e.g., those people who smoke). Recently, spiral CTscanning has shown promise as a potential screening tool for findinglung cancer at an early stage. However, at this juncture it is not knownwhether the use of spiral CT scans improves the prognosis for long-termsurvival by increasing the early detection of the disease. Even with ascan indicating the possible presence of pre-cancerous tissue, theability to take a biopsy for testing is difficult without causing thelungs to collapse, which can result in a required hospital stay.

Each condition where access to tissue for examining or diagnosing acondition, or where obtaining a biopsy would be desirable, presents itsown challenges. The, lung, however, presents a useful platform forunderstanding issues relating to accessing and treating target sites aswell as obtaining biopsies.

In the lung, any time a procedure requires an instrument to be insertedthrough an incision in the chest wall, the pleural layers surroundingthe lung are pierced or compromised. As a result of the propensity fortransthoracic procedures to cause, for example, pneumothorax, there is alimitation on the outer diameter of the instruments that are used forthese procedures. This is a significant drawback for procedures such aspercutaneous transthoracic lung tissue biopsy, where theinterventionalist introduces a biopsy needle through the chest wall.Other procedures which are limited when applied to transthoracicprocedures include percutaneous transthoracic needle aspiration (PTNA),mediastinoscopy, thorascopy and drainage of pleural effusions. Air leaksand bleeding frequently occur either during insertion or removal of thedevice through the opening in the pleural lining of the chest cavity.Even when using small needles of 19-23 gauge, the incidence ofpneumothorax is relatively high, being in the range of 30-40% and theincidence of hemothorax is 25%. Because of the anatomical challenges andphysiological mechanics of the lung, accessing the target site oranatomic location on a first attempt is very important.

Even during the biopsy process currently practiced, multiple tissuesamples or cores may be taken through the smallest gauge needle possiblein an effort to increase biopsy efficacy while decreasing the likelihoodof, for example, pneumothorax. However, each time the needle isreinserted, the chances for pneumothorax or bleeding increase.Additionally, due to the small size of the multiple samples, thepathologist may not have the benefit of a sample size large enough toimprove the accuracy of diagnosis.

Thus, there exists a need for devices and methods that provide minimallyinvasive access to a target site or anatomic location, such as lungtissue, for diagnostics and treatment which are able to access thetarget site more accurately. In the context of the lung, there is a needfor such a device that does not increase the risk of causing the lung tocollapse, or air or blood entering the pleural space. The presentinvention satisfies these needs and provides related advantages as well.

SUMMARY OF THE INVENTION

A variety of steerable needles, lancets, trocars, stylets, cannulas,devices and systems are provided for examining, diagnosing, treating, orremoving tissue, cells or fluid. The steerable needles, lancets,trocars, stylets, cannulas, devices and systems also provide a platformfor delivery of target materials, such as therapeutics, biologics,polymers, glues, etc., to a target site within a patient.

An embodiment of the invention includes a steerable device for use inaccessing a target site in a patient comprising: a steerable memberadapted to penetrate tissue; and a steering mechanism adapted to beoperated by a user to apply a bending force to bend the steerable memberto access the target site.

Another embodiment of the invention includes a steerable device for usein accessing a target site in a patient comprising: a steerable memberadapted to penetrate tissue; and a steering mechanism adapted to beoperated by a user to actively change a shape of the steering member toaccess the target site.

Still another embodiment of the invention includes a steerable devicefor use in accessing a target site in a patient comprising: a steerablemember adapted to penetrate tissue, the steerable member having asubstantially straight shape when in an unstressed condition; and asteering mechanism adapted to be operated by a user to bend thesteerable member to access the target site.

In any of these embodiments of the invention, the steering mechanism canbe adapted to apply a bending force to the steerable member afterpenetrating the tissue. Additionally, mechanisms can also be providedthat are adapted to apply a bending force that increases the strain onthe steerable member to induce curvature. Moreover, the steerable membercan be further adapted in the embodiments to create a path to the targetsite during operation. The steerable device can be adapted to penetratetissue directly or indirectly, i.e., by being positioned within a devicethat is adapted to penetrate tissue.

In still other embodiments, an outer sheath can be provided. For theembodiments having an outer sheath, relative positions of a distal endof the steerable member and a distal end of the outer sheath can beadapted to remain the same, or substantially the same, upon applicationof the bending force.

In yet other embodiments, the steerable device can have a steeringmechanism with at least one pull wire, or a plurality of differentialwires or pull wires. For other embodiments, the steerable member can beconfigured to comprise coaxial members. For embodiments with a coaxialmember, the coaxial members can comprise an outer needle and a lancetdevice disposed within the needle and adapted to be bent by the steeringmechanism. Thus, for example, the coaxial members can be configured tocomprise a lancet device in a first configuration and an aspirationdevice in a second configuration. Other combinations and configurationsare also possible. The device can also be used to guide anotherinstrument to the target site.

Still another embodiment of the invention includes a steerable devicefor use in accessing target site or anatomic location in a patientcomprising: an outer sheath; a steerable member positioned within theouter sheath having a deformable control wire adapted to engage a firstend of the steerable member and a second end of the steerable member;and a control mechanism adapted to provide control of a distal end ofthe steerable device from a proximal end adapted to provide access to atarget location of a subject through an access lumen in the patient.

Another embodiment of the invention includes a steerable device for usein accessing target site or anatomic location in a patient comprising:an outer sheath having a flange with an optional position indicatormarked on the flange; a steerable member positioned within the outersheath; and a control mechanism having at least one position indicatoron a proximal surface of the control mechanism and which is adapted toprovide control of a distal end of the steerable device from a proximalend adapted to provide access to a target location of a subject throughan access lumen in the patient.

Yet another embodiment of the invention includes a steerable device foruse in accessing a target site or anatomic location in a patientcomprising: an outer sheath; a steerable member positioned within theouter sheath having a plurality of control wires adapted to engage afirst end of the steerable member and a second end of the steerablemember; and a control mechanism adapted to provide control of a distalend of the steerable device from a proximal end adapted to provideaccess to a target location of a subject through an access lumen in thepatient.

Still another embodiment of the invention includes a steerablepercutaneous device for use in accessing target site in a patientcomprising: an outer sheath; a steerable member positioned within theouter sheath having a steering wire housed within a notched controlmember; and a control mechanism adapted to provide control of a distalend of the steerable system from a proximal end adapted to provideaccess to target site of a subject through an access hole in thepatient. Access can be made percutaneously, if desired, or by othermechanisms as discussed herein.

Any of the embodiments can also include an outer sheath that is formedof a flexible material. Additionally, embodiments can provide for anouter sheath with a flange at a proximal end. The flange can further beprovided with position indicators. In still other embodiments of theinvention, the outer sheath can form a cup at a proximal end forengaging a spring, or axial control mechanism, used to control movementof the steerable member in at least one axis.

Embodiments of the device also contemplate use of an external controldevice that is accessible from a remote location either wired orwirelessly. Such a control mechanism can be configured to engage thesteerable member, the outer sheath, the control mechanism, orcombinations thereof. Remote access can be from another room, anotherlocation, or a position within the room where the patient is not inphysical contact with the interventionalist controlling the device.

The control mechanisms of each of the embodiments described enablemovement of a distal end of the steerable percutaneous device up to 360°about a first axis, and/or up to 180°, or more, about a second axis.

Embodiments of the invention include appropriate control mechanisms,such as handles, knobs, thumb screws, thumb wires, ball controls and/orjoysticks.

The steerable devices can be cannulated. The steerable devices can alsobe adapted to remove target tissue, cells or fluid, deliver therapy to atarget site (including tissues, cells or fluid) or diagnose a targetsite. In some embodiments, it may be desirable to adapt and configurethe steerable member to make it removable from the lumen of the outersheath, such as once the device has been advanced to the target site.Once removed, the steerable member can be replaced with a member adaptedto remove target site, deliver therapy to target site or diagnose targetsite.

Yet another aspect of the invention provides a biopsy needle whosesampling tip can be more easily steered from outside the patient. Stillanother aspect of the invention provides a biopsy needle whose samplingtip can be steered and controlled from a position remote from an imagingradiation field. Another aspect of the invention is a steerable biopsyneedle whose position can be held in place during imaging. The biopsyneedles are adapted and configured to remove tissue, cells or fluidsfrom the target site.

Another aspect of the invention is a steerable needle, lancet, trocar,stylet, cannula, device and/or system that can be easily steered fromoutside the patient to: a) guide a needle towards an intended targetsite or target sample; b) guide devices that provide or extract energyto kill or remove cancer cells; and c) guide ports to extract or infusefluids, solids or glues in or out of body cavities that requireassistance to access. The steerable needle, lancet, trocar, stylet,cannula, device and/or system may be removable or integral with any ofthese devices to simplify use and allow the user to steer at any timeduring the procedure. Devices that incorporate aspects of the steerableaspect of the invention include, for example:

-   -   a. Co-axial dual members: wherein an outer needle is guided by a        steerable needle, lancet, trocar, stylet, cannula, device and/or        system and the device can be replaced by a second inner device        that is used to aspirate a target tissue, such as cancer cells,        for biopsy and diagnostic characterization. The outer needle can        be left in place to be used as a guide for the inner needle to        harvest multiple sequential samples.    -   b. Steerable needle, lancet, trocar, stylet, cannula, device        and/or system that can steer a flexible cannula to regions in a        patient's body that cannot otherwise be accessed or present        anatomical challenges in accessing. The steerable needle,        lancet, trocar, stylet, cannula, device and/or system may be        removed to increase the port lumen size to enhance drainage or        infusion of liquids, solids or materials that solidify such as        glues.    -   c. A steerable needle, lancet, trocar, stylet, cannula, device        and/or system comprised of or made to guide a tissue removing        device. Such an embodiment would include a device that may use        stored energy to shear tissue in order to sample and examine its        condition. The device can be used to sample or extract cancerous        tissue or entire tumors. The device may also use radio frequency        waves to simultaneously cut tissue and coagulate blood that        could otherwise cause bleeding complications.    -   d. A steerable needle, lancet, trocar, stylet, cannula, device        and/or system may be devised to extract heat energy in order to        freeze and kill pathologic tissue.    -   e. A steerable needle, lancet, trocar, stylet, cannula, device        and/or system may be devised to deliver energy in order to heat        and kill pathologic tissue. The energy can be delivered to the        tissue in the form of light or magnetic energy such as radio        frequency, microwave, ultrasound, laser derived light, or        radiation wave forms such as x-ray energy. A device that        delivers any combination of cryoablation and the other forms of        energy can be configured to kill tissue with different levels of        intensity and depth. This adaptability is useful for widespread        dense tumors. The steering feature allows for convenient and        quick use of the different energy modalities to be applied to        different regions within the patient.

In an embodiment of the methods of the invention, a method is providedfor delivering a device to a target site in a patient comprising:penetrating tissue with a steerable member; and applying a bending forceafter penetrating the tissue to bend the steerable member to deliver thedevice to the target site.

In another embodiment of the methods of the invention, a method isprovided for delivering a device to a target site in a patientcomprising: penetrating tissue with a steerable member; and activelychanging a shape of the steering member after penetrating the tissue todeliver the device to the target site.

In still another embodiment of the methods of the invention, a method isprovided for delivering a device to a target site in a patientcomprising: introducing a steerable member through a scope; and applyinga bending force to bend the steerable member to deliver the device tothe target site.

In some embodiments of these methods the further step of advancing thesteerable member through the tissue is provided. In other embodiments,the method of applying a bending force further comprises bending abendable portion of the steering member while the bendable portion ofthe steering member is positioned within tissue. In some embodiments ofthe method, the further step of aspirating at the target site can beprovided. In still other embodiments of the method, the further step ofremoving target material (e.g., tissue, cells or fluid) at the targetsite, draining the target site, infusing the target site with a marking,therapeutic or diagnostic material, delivering energy to the targetsite, extracting heat energy from the target site, and/or killing targetmaterial at the target site can be included.

Embodiments of the invention also include a method of using a steerabledevice having an outer sheath and a steerable member, comprising:introducing a steerable device; advancing the device toward a targetsite; and deforming a distal tip of device from a longitudinal axis of adevice. In some methods the step of applying a force to the distal tipof the device is accomplished remotely. Applying a force includesbending or deforming the distal tip. In at least some embodiments, thebending caused by the application of force can be up to 360° around afirst axis, and/or up to 180°, or more, around a second axis. In somemethods, the embodiments include the additional step of removing thesteerable member and replacing the member with a member adapted toremove target tissue, cells or fluid, deliver therapy to target tissue,cells or fluid, or diagnose target tissue, cells or fluid.

Another aspect of the invention includes a method comprising the stepsof: determining, using diagnostic testing, that a steerable device mustbe advanced to a specific location in the body; introducing the deviceinto the body; and manipulating the shape of the device to cause shapechanges while the device is in the body to influence a new path ofadvancement for the device. The method can be achieved by a deviceenabling remote access and control of the steerable devices disclosed.

Yet another aspect of the invention includes a method comprising thesteps of: determining, using diagnostic testing devices, that a devicemust be advanced to a specific location in the body; introducing asteering device into the body; manipulating the shape of the steeringdevice to cause shape changes while it is in the body to influence a newpath of advancement; and introducing an instrument into the body.

Still another aspect of the invention includes a method comprising thesteps of: determining, using diagnostic testing devices, that foreignmatter exists in a patient's body that must be sampled; introducing asampling instrument into the body; and manipulating the shape of theinstrument to cause shape changes while the instrument is in the body toinfluence a new path of advancement.

Still another aspect of the invention includes a method comprising thesteps of: using a device to obtain an image of a patient's body alongwith the steerable device contained therein. The image can be obtainedat discrete intervals or concurrently to advancing and steering thedevice using techniques available in the art.

Yet another aspect of the invention includes a method comprising thesteps of determining, using a diagnostic testing device, that foreignmatter exists in a patient's body that must be sampled; introducing asteering element into the body; manipulating the shape of the element tocause shape changes while it is in the body to influence a new path ofadvancement; introducing a sampling instrument into the body; andimaging the body and device.

Still another aspect of the invention includes a method comprising thesteps of: determining, using a diagnostic testing device, that foreignmatter exists in a patient's body that must be sampled; introducing asteering element into the body; manipulating the shape of the instrumentto cause shape changes while the instrument is in the body to influencea new path of advancement; imaging the body and device.

Another aspect of the invention includes a method comprising the stepsof: determining, using a diagnostic testing device, that foreign matterexists in a patient's body that must be sampled; introducing a needleinstrument into the body that can be steered; manipulating the shape ofthe instrument to cause shape changes while the instrument is in thebody to influence a new path of advancement; imaging the body anddevice.

Still another aspect of the invention includes a method comprising thesteps of: determining, using a diagnostic testing device, that foreignmatter exists in a patient's body that must be sampled; introducing asampling instrument into the body; manipulating the shape of theinstrument to cause shape changes while the instrument is in the body toinfluence a new path of advancement from a location more than 2 inchesaway from the body entry point; and imaging the body and device.

Another aspect of the invention includes a method comprising the stepsof: determining, using a diagnostic testing device, that foreign matterexists in a patient's body that must be sampled; introducing a steeringelement into the body; manipulating the shape of the element to causeshape changes while the instrument is in the body to influence a newpath of advancement from a location more than 2 inches away from thebody entry point; imaging the body and device.

Yet another aspect of the invention includes a method comprising thesteps of: determining, using a diagnostic testing device, that foreignmatter exists in a patient's body that must be sampled; introducing asteering element into the body; manipulating the shape of the steeringelement to cause shape changes while the instrument is in the body toinfluence a new path of advancement from a location more than 2 inchesaway from the body entry point; imaging the body and device using animaging device; and introducing a sampling instrument into the body.

Still another aspect of the invention includes a method for palpating,encapsulating, isolating, removing and killing target tissue, cells orfluid in a patient's body by advancing a steerable device to the targetsite.

Another aspect of the invention includes the provision of devices andmaterials disclosed in the form of a kit.

INCORPORATION BY REFERENCE

All publications and patent applications mentioned in this specificationare incorporated by reference to the same extent as if each individualpublication or patent application was specifically and individuallyindicated to be incorporated by reference.

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features of the invention are set forth with particularity inthe appended claims. A better understanding of the features andadvantages of the present invention will be obtained by reference to thefollowing detailed description that sets forth illustrative embodiments,in which the principles of the invention are utilized, and theaccompanying drawings of which:

FIGS. 1A-D illustrates the anatomy of the respiratory system, along withan example of hemothorax caused from blood entering the pleural space.

FIG. 2A illustrates a lung having a target site for biopsy; FIG. 2Billustrates a needle being advanced toward the target site; FIG. 2Cillustrates a needle that has been advanced toward the target site butwhich has failed to connect to the tissue;

FIG. 3 illustrates a patient in an image capture chamber with atechnician monitoring the process from another room;

FIGS. 4A-E illustrate perspective and cross-sectional views of asteerable device capable of accessing target site or anatomic locations;

FIGS. 5A-F illustrate perspective and cross-sectional views of anothersteerable device capable of accessing target site or anatomic locations;

FIGS. 6A-E illustrate perspective and cross-sectional views of yetanother steerable device capable of accessing target site or anatomiclocations;

FIGS. 7A-E illustrate perspective and cross-sectional views of stillanother steerable device capable of accessing target site or anatomiclocations;

FIGS. 8A-E illustrate perspective and cross-sectional views of anothersteerable device capable of accessing target site or anatomic locations;

FIGS. 9A-E illustrate perspective and cross-sectional views of anothersteerable device capable of accessing target site or anatomic locations;

FIGS. 10A-C illustrate perspective and cross-sectional views of yetanother steerable device capable of accessing target site or anatomiclocations;

FIGS. 11A-G illustrate perspective and cross-sectional views of stillanother steerable device capable of accessing target site or anatomiclocations;

FIGS. 12A-C illustrate cross-sectional views of a variety of distal tipdesigns suitable for use with any of the steerable devices shown inFIGS. 4-11;

FIGS. 13A-F illustrate cross-sectional views of a variety of proximalcontrol designs suitable for use with any of the steerable devices shownin FIGS. 4-11;

FIGS. 14A-B illustrate mechanisms for remote control of the steerabledevices shown in FIGS. 4-11;

FIGS. 15A-B illustrate additional mechanisms for control of thesteerable devices shown in FIGS. 4-11;

FIG. 16 illustrates a physician or technician controlling the steerabledevices shown in FIGS. 4-11 to access target site on a patient using,for example, remote access devices shown in FIGS. 14 and 15;

FIG. 17 illustrates a cross-sectional view of a steerable device used asa biopsy device to capture a tissue sample at its distal end;

FIGS. 18A-C illustrate a variety of systems for controlling temperaturesensing and delivery of heat or cold (FIG. 18A); temperature sensing anddelivery of energy to produce heat and throttling gas to extract heat(FIG. 18B); and delivery of RF for cutting and coagulation (FIG. 18C)used in connection with the steerable devices shown in FIGS. 4-11;

FIG. 19 illustrates a lung having a steerable device positioned toaccess a target site;

FIG. 20 illustrates a bronchoscope in combination with a steerabledevice; and

FIG. 21 illustrates the steps of a method for deploying the devicesdescribed herein.

DETAILED DESCRIPTION OF THE INVENTION

As noted above, the present invention is suitable for use inpercutaneously accessing a target site within a body, as well astraversing tissue and lumens between an access point on the body and atarget site in the body. The invention is also suitable for accessing atarget site through body lumens such as the trachea and the vasculature.A target site can be located in any anatomic location in the body.Typically a site is identified by the physician or radiologist and thetissue, cells and/or fluid, or other material at that site, is thenidentified as target material and selected or targeted for access. Thus,for example, the target tissue, cells or fluid can be the targetmaterial identified for access from: brain, heart, liver, kidney,thyroid, lung, pancreas, intestine, uterine, ovary, prostate, lymph,spleen, skin, biliary, parathyroid, pituitary, adrenal gland,mediastinum, bladder, connective tissue, breast, gastrointestinal tract,joints, muscle, etc. Additionally, in some instances it is desirable toaccess a target site located within a void, such as a space betweenorgans, lumen, etc. In that instance, the target site may include fluid,or other material which is the target for access. Once the target siteis accessed and target material (e.g. tissue, cells and/or fluid) isidentified for access, one or more diagnostic, therapeutic or deliveryprocedures can be employed to remove, treat and/or mark the targetmaterial.

An application of the device includes safely performing a transthoracicprocedure without impacting the negative pressure required to maintainlung function. Thus, in addition to other applications, the presentdevices allow accessing the interior of the lung or the surroundingtissue to perform therapeutic or diagnostic functions while reducing therisk of complications associated with the accessing procedure. Thepresent invention includes the use of the disclosed devices with, forexample, a bronchoscope. See, for example, U.S. patent application Ser.No. 11/153,296 filed Jun. 18, 2005 entitled Lung Access Device (Mathis).The devices disclosed can also be adapted for use with other devices,without departing from the scope of the invention.

The invention provides methods, and devices for obtaining targetmaterial from a body, such as lung tissue. Although the device can beused to obtain a variety of target materials, such as tissue, within abody, for purposes of illustration the device arid its operation will bediscussed in the context of lung tissue, which presents additionalchallenges for biopsy capture also addressed by the designs of theinvention. Additionally, the devices can be used in combination withsuitable rigid, flexible, and steerable scopes, such as a bronchoscope.Other scopes, including, but not limited to, colonoscopes,thoracoscopes, laparoscopes, and/or endoscopes, can also be used,depending upon the location of the target site to be accessed.Additional information pertaining to scopes is available in; forexample, U.S. Pat. No. 6,478,730 entitled Zoom Laparoscope (Bala etal.); U.S. Pat. No. 6,387,044 entitled Laparascope Apparatus (Tachibanaet al.); U.S. Pat. No. 6,494,897 entitled Method and System forPerforming Thoracoscopic Cardiac Bypass Surgery (Sterman et al.); U.S.Pat. No. 6,964,662 entitled Endoscopic Forceps Instrument (Kidooka);U.S. Pat. No. 6,967,673 entitled Electronic Endoscope System withColor-Balance Alteration Process (Ozawa et al.).

The invention also provides methods for encapsulating target material,killing target material, including muscle, nerve, connective andepidermal tissue and interstitial fluids, providing a mechanism forpalpating a target site, and delivering target markers and biologicallyactive and/or therapeutic compounds to a target site.

As mentioned, the lung is used to illustrate the advantages andoperation of the devices disclosed. FIG. 1A illustrates the respiratorysystem 10 located primarily within a thoracic cavity 11. The respiratorysystem 10 includes the trachea 12, which brings air from the nose 8 ormouth 9 into the right primary bronchus 14 and the left primary bronchus16. From the right primary bronchus 14 the air enters the right lung 18;from the left primary bronchus 16 the air enters the left lung 20. Theright lung 18 and the left lung 20, together comprise the lungs 19. Theleft lung 20 is comprised of only two lobes while the right lung 18 iscomprised of three lobes, in part to provide space for the hearttypically located in the left side of the thoracic cavity 11, alsoreferred to as the chest cavity.

As shown in more detail in FIG. 1B, the primary bronchus, e.g. leftprimary bronchus 16, that leads into the lung, e.g. left lung 20,branches into secondary bronchus 22, and then further into tertiarybronchus 24, and still further into bronchioles 26, the terminalbronchiole 28 and finally the alveoli 30. The pleural cavity 38 is thespace between the lungs and the chest wall. The pleural cavity 38protects the lungs 18, 20 and allows the lungs to move during breathing.As shown in FIG. 1C, the pleura 40 defines the pleural cavity 38 andconsists of two layers, the visceral pleurae 42 and the parietal pleurae44, with a thin layer of pleural fluid therebetween. The space occupiedby the pleural fluid is referred to as the pleural space 46. Each of thetwo pleural layers 42, 44 are comprised of very porous mesenchymalserous membranes through which small amounts of interstitial fluidtransude continually into the pleural space 46. The total amount offluid in the pleural space 46 is typically slight. Under normalconditions, excess fluid is typically pumped out of the pleural space 46by the lymphatic vessels.

The lungs 19 are an elastic structure that float within the thoraciccavity 11. The thin layer of pleural fluid that surrounds the lungs 19lubricates the movement of the lungs within the thoracic cavity 11.Suction of excess fluid from the pleural space 46 into the lymphaticchannels maintains a slight suction between the visceral pleural surfaceof the lung pleura 42 and the parietal pleural surface of the thoraciccavity 44. This slight suction creates a negative pressure that keepsthe lungs 19 inflated and floating within the thoracic cavity 11.Without the negative pressure, the lungs 19 collapse like a balloon andexpel air through the trachea 12. Thus, the natural process of breathingout is almost entirely passive because of the elastic recoil of thelungs 19 and chest cage structures. As a result of this physiologicalarrangement, when the pleura 42, 44 is breached, the negative pressurethat keeps the lungs 19 in a suspended condition disappears and thelungs 19 collapse from the elastic recoil effect.

When fully expanded, the lungs 19 completely fill the pleural cavity 38and the parietal pleurae 44 and visceral pleurae 42 come into contact.During the process of expansion and contraction with the inhaling andexhaling of air, the lungs 19 slide back and forth within the pleuralcavity 38. The movement within the pleural cavity 38 is facilitated bythe thin layer of mucoid fluid that lies in the pleural space 46 betweenthe parietal pleurae 44 and visceral pleurae 42.

For purposes of illustration, FIG. 1D illustrates a lung 20 with blood50 in the pleural space (also referred to as hemothorax). As evidencedfrom the drawing, the presence of blood 50 in the pleural space 46results in a contraction of the lung 20 to a much smaller size.Clinically, the patient would have a difficult time breathing air intothe collapsed lung because the act of breathing relies on the lungsbeing suspended in a state of negative pressure. As will be appreciatedby those of skill in the art, fluid or air within the pleural space 46will achieve a similar clinical impact on the size of the lung relativeto the thoracic cavity as the hemothorax illustrated in FIG. 1D. Becauseof the anatomical design of the lungs, and the negative pressurerequired to maintain the lungs in a suspended state, obtaining tissuesamples from the lungs presents additional challenges that are notpresent for other tissues.

FIGS. 2A-C depict the lungs 19 during a procedure wherein a biopsydevice 80 is deployed to obtain a target sample 82, or target material,from the lung and breaches the pleura. As a result of the breach, air 88inside the affected lung 20 exits the lung (indicated by arrows) aroundthe opening 84 in the lining made by the device 80. As in the previousexample, air inside the affected lung 20 exits the lung (indicated byarrows) around the opening 84 created when the device 80 punctured thewall of the bronchus 14. Additionally, as will be appreciated by thoseof skill in the art, the trajectory of the device 80 can be such thatthe device 80 fails to access the target site for a biopsy, asillustrated in FIG. 2C.

As stated above, the invention and its embodiments are described forpurposes of illustration with respect to access, diagnostic treatmentand removal of target tissue, cells or fluid in the lung. However,aspects of the devices and methods are applicable to diagnostic andtherapeutic procedures for other target tissues, cells or fluids withinthe body as well.

FIG. 3 illustrates a patient 52 in an image capture chamber 54, such asa room having an x-ray machine, with a physician or technician 56monitoring an image capture process from, for example, a location 58such as a separate room. The image capture process employs a machine 60suitable for image capture. Often when patients 52 undergo a procedureto obtain a target sample, an attempt is made to position a device toaccess a target site and then a confirmatory image is taken to ensurethat the target material was obtained. As will be appreciated by thoseof skill in the art, suitable mechanisms for determining the location ofthe device used to access a target material relative to the target siteemploys, unless otherwise indicated, conventional devices 60 and methodsand techniques known in the art. These conventional devices andtechniques include: x-ray imaging and processing, x-ray tomosynthesis,ultrasound including A-scan, B-scan and C-scan, computed tomography (CTscan), spiral CT, magnetic resonance imaging (MM), optical coherencetomography, single photon emission computed tomography (SPECT) andpositron emission tomography (PET), fluoroscopy and combinations andportable versions thereof are within the skill of the art. Suchtechniques are explained fully in the literature and need not bedescribed herein. See, e.g., X-Ray Structure Determination: A PracticalGuide, 2nd Edition, editors Stout and Jensen, 1989, John Wiley & Sons,publisher; Body CT: A Practical Approach, editor Slone, 1999,McGraw-Hill publisher; X-ray Diagnosis: A Physician's Approach, editorLam, 1998 Springer-Verlag, publisher.

FIGS. 4A-E illustrate perspective and cross-sectional views of asteerable device 100 capable of accessing a target sample of materialfrom a target site. Components of the device 100 include an optionalouter sheath 110, which can be in the form of a cannula, flexible tubeor hypotube, to name a few, and a steerable member 120. The sheath canbe made from suitable biocompatible polymers and metals such as titaniumand nickel-titanium alloys (Nitinol), stainless steel, fluoropolymers,polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), expandedpolytetrafluoroethylene (ePTFE), polyurethane, nylons, polyimide films(Kapton®), and the like. Reference to suitable polymers that can be usedin the invention can be made found in: PCT Publication WO 02/02158 A1,dated Jan. 10, 2002, entitled Bio-Compatible Polymeric Materials; PCTPublication WO 02/00275 A1, dated Jan. 3, 2002, entitled Bio-CompatiblePolymeric Materials; and, PCT Publication WO 02/00270 A1, dated Jan. 3,2002, entitled Bio-Compatible Polymeric Materials.

A control mechanism 130 adapted to be controlled by a user, such as atechnician, is provided at a proximal end 102 to enable steering. Thedistal end 104, which is positioned away from the proximal end typicallypositioned outside the patient's body (or nearest a user), can beadapted and configured in a variety of ways to achieve the diagnostic ortherapeutic objective of the device. For example, the distal end 104 canbe configured as a trocar, lancet, stylet, needle, therapeutic deliverydevice, marker, or diagnostic delivery device, to name a few. In theembodiment depicted, the control mechanism 130 at the proximal end 102includes a knob 132 and a spring 134 or coil. Proximal and distal are,however, relative terms, which do not limit the scope of thedescription.

The spring 134 may be a coiled wire formed of suitable material capableof maintaining a desired spring tension. A plurality of coils of thecoiled body form a lumen sized and adapted to fit around the exterior ofthe control mechanism 130. Some embodiments include a second coiled bodyalong with a first coiled body. As illustrated in the cross-sectionallongitudinal views of FIGS. 4B and 4C, the steerable member 120 islocated within the outer sheath 110 such that the steerable member 120is capable of longitudinal movement 106 within a lumen 112 in the sheath110. The spring 134 at the proximal end 102 fits within an section ofthe sheath 110 that has a lumen 112′ at its proximal end 102 having adiameter large enough to accommodate the steerable member 120 and thespring 134. Thus, the sheath cups the spring at its proximal end.Although the spring 134 can be formed from, for example, a compressionsleeve, it is anticipated that typically a spring 134 is provided thatis formed from a material capable of forming a spring with optimalspring force, such as stainless steel. However any structure capable ofproviding spring force to the device for controlling the movement of thesteerable member 120, as discussed herein, will be suitable, as will beappreciated by those of skill in the art.

In addition to the longitudinal movement along a longitudinal axis Lthat is achievable by pulling and pushing the knob 132 proximally anddistally, rotational movement 108 is also achievable by turning the knob132 clockwise and counterclockwise, as desired. Thus, the distal end ofthe steerable device is capable of 360° movement about at least oneaxis.

From the cross-sectional view shown in FIG. 4D, which is taken along thelines D-D in FIG. 4B and perpendicular to the longitudinal axis L of thedevice 100, the outer sheath 110 has a lumen 112 sized to receive asteerable member 120 such that the steerable member 120 can move withinthe lumen 112 of the outer sheath 110. As illustrated in thecross-sectional view of FIG. 4E, taken along the lines of E-E of FIG.4B, the diameter of the outer sheath 110 is larger relative to thediameter of the steerable member 120 such that at least a portion ofspring 134 can be positioned between the two components. Thus, thesteerable member 120 has been illustrated with a central lumen 122. Sucha configuration would be useful where the steerable member 120 isadapted, for example, to deliver therapy (e.g. materials to a targetsite), or remove target tissue, cells or fluid, to name a few. Theproximal end of the outer sheath 120 has a larger diameter and forms acup for retaining or engaging at least a portion of the spring. Thesteerable member 120 can be formed of any suitable material includingshape memory nickel-titanium alloys (Nitinol); the outer sheath can beformed from any suitable material such as stainless steel, titaniumtubing or biocompatible polymers. The steerable member 120 can beconfigured to lock or engage the outer sheath 110 to control therelative movement of the steerable member 120 to the outer sheath 110.

In at least one embodiment, the device 100 is radiopaque at least at itsdistal tip. The outer sheath 110 can also be formed from plastic with ametal tip or a polymer that has been loaded with bismuth, tantalum,platinum, or other dense metal. The sheath can also be formed fromnickel-titanium super elastic shape memory alloys (Nitinol), includingnormalized, austentitic or martensitic forms. The outer diameter of thesheath, or exterior profile, can be from 10-28 gauge, more typicallyaround 23 gauge. The overall length of the device 100 can be anywherefrom 1 inch to, for example, 17 inches, or any suitable length.

In operation of the steering features, as the steerable member 120 isadvanced in a distal direction and exits the distal end 104 of thesheath 110, the distal end of the steerable member 120 assumes a curvedshape that deviates away (angle α) from a longitudinal axis L of thedevice 100. The outer sheath 110 or steerable member 120 can act as adilator. The amount of deviation away from the central axis L iscontrolled by the user and the amount of distance the distal end 104 ofthe steerable member 120 extends out of the sheath 110. As the steerablemember 120 is drawn back into the sheath 110 (i.e., pulled proximallytoward the user and/or controls), the angle α is decreased. Thereduction of angle α a can be caused by pressure applied to thesteerable member 120 by the interior surface 113 of the sheath 110 whichcauses the steerable member 120 to straighten out. Thus, when advancingtoward a target site, the entire mechanism (sheath 110 and steerablemember 120) is advanced toward the tissue. As the location of the device100 relative to the target site is assessed (using, for example, animage capture machine 60 discussed with respect to FIG. 3) and it isdetermined that the trajectory of the device 100 has deviated from thedesired target site (see, for example, FIGS. 2B-C), the steerable member120 can be advanced distally toward the tissue while maintaining thesheath 110 in a fixed, or largely fixed location, to enable the device100 to reach the target site. As will be appreciated by those of skillin the art, the step of advancing the device 100, and advancing only thesteerable member 120 can be alternated as required to optimize accessingthe target site. In addition to controlling the location of the device100 by advancing the device 100 and/or the steerable member 120, furthercontrol can be achieved by rotating the knob 132 clockwise andcounterclockwise. The position of any or all components of the devicecan be locked into place, e.g. by engaging the steerable member 120 andthe outer sheath 110, to prevent further movement of the device 100 ordevice components, as desired.

The device 100 can achieve, for example, up to 360° movement about atleast one axis, such as longitudinal axis L, and up to 180°, or more,movement about any remaining axes, depending upon the curve of thesteerable member. Greater or less steerability can be provided for byaltering the design of the device as disclosed herein. Once the deviceis in place, the steerable member 120 can be withdrawn from the outersheath 110 and replaced with, for example, a syringe, or other suctionsource, and a tissue sample may then be aspirated into the outer sheathand withdrawn from the patient. Additionally, the two part configurationenables the outer sheath 110 to be made with a thinner wall whichresults in an overall lower profile (i.e., diameter or circumference)making the device less invasive. Alternatively; the steerable member 120can be replaced with a device or system that administers therapy to thetarget site.

FIGS. 5A-F illustrate perspective and cross-sectional views of anothersteerable device 200 capable of accessing a target site. The steerabledevice 200 has a proximal end 202 and a distal end 204. An optionalsheath 210 is provided having an inner lumen 212 for receiving asteerable member 220. In the configuration shown in FIG. 5, thesteerable member 220 has a notched tubular member 221 that houses aninner control member 223.

The inner control member 223 is configured to have a distal end having adiameter larger than the inner diameter of the notched tubular member221, such that the distal end extends beyond the distal end of thetubular member and is prevented from being pulled within the lumen ofthe notched tubular member. Thus the distal end of the inner controlmember 223 can form an end 224 such as a ball or bulbous end, asdepicted, or a flange that catches the notched tubular member. As willbe appreciated by those skilled in the art, the distal end of the innercontrol member 223 can also be removable. In one configuration, the end224 can be removably attachable to the end of the control member 223 byappropriate mechanisms, e.g. threaded male end on the control member 223engaging a threaded female end of the end 224. In another configuration,the end 224 can be soldered to the control member 223, if desired.Designs where the end 224 and control member 223 act in a unifiedmanner, including designs where the control member 223 and end 224 areone piece, are also within the contemplated design. The inner controlmember 223 is capable of movement 206 along a longitudinal axis L of thedevice 200, as well as rotational movement 208 clockwise andcounterclockwise around the longitudinal axis L of the device 200.

The notched tubular member 221 has an inner lumen 222 that is configuredto surround the control member 223 and engage the end 224 at the distalend of the tubular member 221. The notched tubular member 221 can alsobe adapted and configured to fit within the lumen 212 of the optionalsheath 210, as illustrated. When placed within the sheath 210, thenotched tubular member 221 has at least a portion that is capable ofmovement 206 along a longitudinal axis L of the device 200.Additionally, at least a portion of the tubular member 221 is fixedwithin the sheath 210. In one configuration, the notched tubular member223 is adapted to fixedly engage the sheath 210 at a proximal end 202.For example, the notched tubular member 223 can be adhered to the sheath210 at a proximal location, or can be releasably engaged at a proximallocation (e.g., by using threads or tongue and groove designs).

Turning to the cross-sections taken along a plane perpendicular to thelongitudinal axis L along the length of the device 200 shown in FIGS.5D-E, it can be seen that the control member 223 is positioned within alumen 222 of the notched tubular member 221. Where the notched tubularmember 221 cross-section cuts across a notched section of the tubularmember 221, the lumen 222 defined by the tubular member 221 at thatcross-section communicates with the lumen 212 defined by the sheath 210,as shown in FIG. 5D. Conversely, where the notched tubular member 221cross-section cuts across a section of the tubular member 221 that isnot notched, the lumen 221 defined by the tubular member 221 at thatcross-section may not communicate with the lumen 212 defined by thesheath 210. The notches 226 can be configured such that a profile, orside view, along a longitudinal axis of the tubular member 221 form asemicircular shape, or u shaped (as illustrated in FIG. 5B), atriangular shape, a square shape, etc. Notches 226 can be in the form ofcuts or ridges as well. Regardless of the geometric profile of the notch226 in a dimension, from at least one view, the upper opposing edges228, 228′ of the notch are positioned such that the opposing edges 228,228′ approach each other when the notches are compressed by moving thecontrol member 223. In some configurations, when the upper opposingedges 228, 228′ of the notches 226 are compressed at least a portion ofthe edge 228 of the notch 226 may appear to disappear completely, e.g.,where the sides of the notches 229, 229′ come into contact with eachother and appear to form a seam. However, as well be appreciated bythose skilled in the art, other configurations of the tubular member arepossible. For example, the cross-section at FIG. 5E can be adapted toengage at a location along its circumference, such as by forming a seam.

In cross-section, for example, the inner control mechanism 223 has asolid circular cross-section and is positioned to fit within the lumen222 of the notched tubular member 221. As shown in FIG. 5D, which istaken across the lines D-D in FIG. 5B, the cross-section is taken acrossa notch 226 of the notched tubular member 221 and therefore the tubularmember 221 has a partial circular cross-sectional shape, such as a “c.”The tubular member 221 and inner control mechanism 223 fit within thelumen 212 of the sheath 210. As illustrated in FIG. 5F, when the innercontrol mechanism 223 is moved axially the notches 226 are broughttogether and the gap between the edges of the notches get smaller. Thus,for example, as shown in FIG. 5F, the partial circular cross-sectionalshape shown in FIG. 5C becomes elliptically shaped for a cross-sectiontaken perpendicular to the longitudinal axis L as the device 200 assumesthe curved configuration shown in FIG. 5C and the cross-section of thenotched tubular member 221 becomes an elliptically shaped, orsubstantially elliptically shaped, “c” with the edges closer to contact.

In the cross-section illustrated in FIG. 5E, which is taken along thelines E-E of FIG. 5B, the exterior of the proximal end of the notchedtubular member 221 is configured to engage the interior of the proximalend of the sheath 210 in order to maintain a permanent or semi-permanentrelationship between the two members (thus preventing rotationalmovement of the notched tubular member 220 without rotational movementof the sheath 210). In the cross-section of FIG. 5E, the parts aremaintained by the use of one or more tongue and groove joints 218 thatengage one component with another. Other mechanisms for engaging thesheath 210 and the notched tubular member 221 would be apparent to thoseskilled in the art, including, for example, the use of a detent on onemember and depressions on another member to provide a snap fitarrangement.

Each of the sheath 210 and the notched tubular member 220 can have aflange 217, 227 to facilitate manipulation by the user and, in the caseof the flange 227 of the notched tubular member 220, the flange 227 canprovide a further mechanism for preventing the notched tubular member220 from advancing entirely into the lumen 212 of the sheath 210 uponmanipulation of the inner control mechanism 223.

In operation of the steering component, pulling or pushing the innercontrol member 223 in an axial direction 206 results in a deformation ofthe steerable member 220 away from a longitudinal axis L of the device200. The amount of deviation of the distal end away from the centralaxis L is controlled by the user and the amount based on the amount ofpush/pull of the inner control of control member 223 of the steerablemember 220. As the inner control member 223 is pulled proximally (i.e.,pulled proximally toward the user and/or device controls), the angle αof the deviation away from the longitudinal axis L, is increased becausethe inner control member 223 pulls the sides deforming the notches 226of the control member (as illustrated in FIG. 5C) which causes thesteerable member 220 to bend in a direction and achieve movement thatis, for example, 180°, or more, off the longitudinal axis in one or moreplanes. Additionally, one component can be pulled, while anothercomponent is pushed to achieve the same result.

The action of the user engaging the control mechanisms and/or flangescauses a bending force to be applied which results in the devicesteering toward a target site. As the bending force increases, thestress on the steerable member increases, which induces a curvature ofthe device. Thus, the strain occurs when the steerable member isdistorted by the user engaging the control mechanism. The application ofa bending force results in an active steering of the designs describedin this invention, as opposed to passive steering resulting fromdeformation to a preformed shape. Combinations of active and passivesteering can be used without departing from the scope of the invention.Further the curvilinear length of each component of the device canremain the same, or substantially the same, as the longitudinal length(for an unbent device) during the steering and advancing processes. Thedevice is adapted and configured to define and create its own path tothe target site. The definition and creation of a path can occurdynamically as the device is advanced through tissue. Thus, for example,as the device is advanced through tissue, the denseness, or otherfeatures, of the tissue may place a stress or strain on the device thatcauses the device to deviate away from a trajectory toward a targetsite. Controlling the location and direction of the distal end of thedevice by engaging the control mechanisms to place a strain, such as anopposing strain or bending force, on the device using the controlmechanisms causes the device to steer toward the target site.

Thus, when advancing toward a target site, the entire mechanism (sheath210 and steerable member 220) is advanced toward the target site. As thelocation of the device 200 relative to the target site is assessed(using, for example, an image capture machine 60 FIG. 3) and it isdetermined that the trajectory has deviated from the trajectory requiredto reach the desired target site (see, for example, FIGS. 2B-C), thesteerable member 220 can be engaged to cause the distal end 204 of thedevice to maintain or deviate from the original trajectory by bendingthe distal end 204 of the device 200. As will be appreciated by those ofskill in the art, the step of adjusting the control member 223 can bealternated as required to optimize accessing the target site.Additionally, a knob, such as those illustrated in other embodiments,can be provided at the proximal end and can be engaged to furtherprovide rotational control of the device 200, providing up to 360°movement of the device around the longitudinal axis L. Separate movementof the sheath 200 relative to the control mechanism 220 can be achievedwhere the mechanisms are disengaged, e.g. where the tongue and grooveare uncoupled, or the male and female threads are disengaged.

FIGS. 6A-E illustrate perspective and cross-sectional views of yetanother steerable device 300 capable of accessing a target sample. Inthis embodiment, an optional sheath 310 is provided with a steerablemember 320 positioned within at least a part of the lumen 312 of thesheath 310. The steerable member 320 has a control wire 324, or pullwire, adapted to engage the steerable member 320 at least at two pointsalong its length. The control wire 324 can be used to cause a differencein location of the distal tip of the steerable member 300 duringactuation. Thus, the wires can be thought of as differential wires forcausing differences in the location of the tip of the devices. Thecontrol wire 324 has a length that is less than the length of thesteerable member 320. The control wire 324 can be formed from a materialhaving elastic properties in at least one direction. As the control wire324 engages the interior surface 313 of the lumen 312 of the sheath 310,the control wire 324 is deformed which results a deformation of thesteerable member 320. A knob 332 is provided at the proximal end 302which in use can, directly or indirectly, control the axial 306 androtational 308 movement of the steerable member 320 within the sheath310. As will be appreciated by those of skill in the art, the controlwire 324 can be in the form of a wire, having a circular cross-sectionalshape (as illustrated), or can be in the form of a band or ribbon (e.g.,flat strip having a square or rectangular cross-sectional shape), or anyother shape that achieves the operational objectives of the devicedesign.

Turning to FIG. 6B, the steerable member 320 is in the form of a centralbeveled needle 340 with a single control wire 324, or pull wire, in theform of a guidewire attached to the steerable member. At portions alongthe length of the steerable member 320 the control wire 324 assumes aconfiguration whereby it is adjacent the interior wall or lumen 313 ofthe sheath 310, as shown in the cross-section of FIG. 6C, or bows awayfrom the steerable member if no outer sheath is present. At otherlocations, the control wire 324 can assume a configuration whereby it isadjacent the surface of the steerable member 320. At still otherlocations, the control wire 324 can assume a configuration whereby it ispositioned equidistant between the interior wall 313 of the sheath 310and the surface 323 of the control wire 324. At yet other locations, thecontrol wire 324 can assume a configuration whereby it comes in contactwith both the interior lumen 313 of the sheath 310 and the exteriorsurface of the steerable member 320. As will be appreciated by thoseskilled in the art, the diameter of the interior lumen of the sheath 310can be constant along its length or can vary along its length, toprovide mechanical pressure on the control wire 324 and/or deformcontrol wire 324.

In operation of the steering features, as the steerable member 320 isadvanced in a distal direction and exits the distal end 304 of thesheath 310, the distal end of the steerable member 320 assumes a curvedshape that deviates away (angle α) from a longitudinal axis L of thedevice 300 and which is controlled by the control wire 324. The amountof deviation away from the central axis L is controlled by the user, theamount of distance the distal end 304 of the steerable member 320extends out of the sheath 310, as well as by the material properties ofthe control wire 324, such as elasticity, deformability, strength, etc.As the steerable member 320 is drawn back into the sheath 310 (i.e.,pulled proximally toward the user and/or controls), the angle a isdecreased because pressure is applied to the control wire 324 by theinterior walls of the sheath 310 which causes the steerable member 320to straighten out. Thus, when advancing toward a target site, the entiremechanism (sheath 310 and steerable member 320) can be advanced towardthe tissue. As the location of the device 300 relative to the targetsite is assessed (using, for example, an image capture machine 60discussed with respect to FIG. 3) and it is determined that thetrajectory has deviated from the desired target site (see, for example,FIGS. 2B-C), the steerable member 320 can then be advanced distallytoward the target site while maintaining the sheath 310 in a fixed, orlargely fixed location, to enable the device 300 to reach the targetsite. As will be appreciated by those of skill in the art, the step ofadvancing the device 300, and advancing only the steerable member 320can be alternated as required to optimize accessing the target site. Insome instances, steering the device may occur actively while forming acurvilinear shape that is equivalent, or substantially equivalent, inlength to the unbent length of the device. In addition to controllingthe location of the device 300 by advancing the device 300 and/or thesteerable member 320, further control can be achieved by rotating theknob 332 clockwise and counterclockwise.

In another operation, the control wire 324 is pushed or pulled as theflange 327 of the steerable member 320 is engaged. This action resultsin the steerable member 320 being held stationary with respect tomovement of the control wire 324. A locking mechanism, as describedabove, can also be incorporated.

FIG. 6E illustrates an alternative cross-sectional view wherein a spring334 is provided to increase the amount of control administered to thedevice 300.

FIGS. 7A-E illustrate perspective and cross-sectional views of stillanother steerable device 400 capable of accessing a target site. Thedevice 400 illustrated in FIG. 7 includes the sheath 410, having asteerable member 420 arid a control member 430. Where the design of FIG.6 provides a single control wire 424, the design of FIG. 7 uses morethan one control wire 424, 424′, or four control wires (as illustrated).A central steerable member 425, which can be in the form of a wire, andfour lateral control wires 424, 424′ are provided that engage a controllever 433. Movement of a tab 435 of the control lever 433 in a directionwill result in controlled movement of the distal end of the device 400causing the distal end of the device to curve toward a target area, suchas target tissue, cells or fluids. The control wire can be metal,polymers, or organic fiber, such as carbon or aramid fibers (Kevlar®).Additionally, the control wire can be glass or ceramic.

In operation of the steering features, for example, as the tab 435 ismoved toward the right, the control wire 424 engaging the control lever433 on the right will be advanced proximally causing the distal tip 404of the device 400 to move toward the left (i.e., movement of the tab ina first direction will cause a movement of the distal end 404 of thedevice 400 in a direction opposing the directional movement of the tab).As illustrated in FIG. 7C the control wires 424, 424′ can be soldered427 to the exterior of the control lever 433. Additionally, or in placeof soldering, the control wires 424, 424′ can be crimped, glued, orcombinations and/or configured to bend at a proximal end such that theproximal end can be placed within a lumen in the control lever 433. Theoperation of the steering features enables a one-handed, highlyaccurate, control of both the steering of the distal tip of the deviceand the advancement of the device along a path toward a target site.

Further, as discussed above, the action of the user engaging the controlmechanisms and/or flanges causes a bending force to be applied whichresults in the device steering toward a target site. As the bendingforce increases, the strain on the steerable member which inducescurvature increases. The application of a bending force results in anactive steering of the designs described in this invention, as opposedto passive steering resulting from deformation to a preformed shape.Further the curvilinear length of each component of the device remainsthe same, or substantially the same, as the longitudinal length (for anunbent device) during the steering and advancing processes. The deviceis configured to create its own path to the target site. This designimproves the usability, consistency and accuracy of operation of thedevice, as well as the ergonomic interface with a user and human factorsdesign considerations.

FIGS. 8A-E illustrate perspective and cross-sectional views of anothersteerable device 500 capable of accessing a target sample. The device500 illustrated in FIG. 8 includes the optional sheath 510, having asteerable member 520 and a control member 530. Where the design of FIG.6 provides a single control wire 324, the design of FIG. 8 uses aplurality of control wires 524, 524′. The provision of additionalcontrol wires 524, 524′ enables the control lever 533 to achieve moreaccurate control of the distal end 504 of the device 500. As will beappreciated by those skilled in the art, a knob 535, or other suitablemechanism, can be provided at the proximal end 502 in order to provideadditional rotational movement to the device 500. The operation of thedevice of FIG. 8 is similar to the operation described with respect tothe embodiment depicted in FIG. 7.

FIGS. 9A-E illustrate perspective and cross-sectional views of anothersteerable device 600 capable of accessing a target sample. In thisembodiment the interior lumen of the distal end 604 of the sheath 610 isconfigured to curve or angle away from the longitudinal axis L, orfurther away from the longitudinal axis L than a section of the sheathproximal to the distal end. Thus, the distal opening 611 of the sheath610 forms a bend 613 that results in the distal opening 611 beingpositioned such that it does not cross all, or part, of the longitudinalaxis L.

In operation of the steering features, as the steerable member 620 ismoved in a longitudinal direction 606, the distal end of the steerablemember 620 advances and causes the bend 613 in the interior of the lumenof the sheath 610 which, in turn, bends the steerable member 620 anamount corresponding to the bend in the interior lumen of the sheath610. As the distal end of the steerable member 620 continues to advancethrough the lumen of the sheath 610 and extend beyond the distal end ofthe sheath, the steerable member is bent away from a centrallongitudinal axis L of the device in a predetermined or determinableamount. Further rotational movement 608 can be achieved by turning acontrol mechanism, such as a sheath knob 614 in a clockwise and/orcounterclockwise direction. As illustrated by the cross-sections shownin FIGS. 9C-D, taken along an axis perpendicular to the longitudinalaxis of the device 600, the lumen 612 of the sheath 610 is positioned ata first location (e.g. a midpoint along the length of the device) morecentrally located than at a second location (e.g., a position at thedistal end). Once the distal end of the control member 620 is advancedbeyond the distal end of the sheath 610, rotational movement of theentire mechanism 600 can be achieved by engaging knob 632. Asillustrated in FIG. 9E, the device 600 can be configured to include theuse of a spring 634. Further the device 600 can be configured such thatonce the control wire 623 achieves the desired location, it can beremoved, leaving an open lumen for administering another component (e.g.a diagnostic device or tissue biopsy device).

FIGS. 10A-C illustrate perspective and cross-sectional views of yetanother steerable device 700 capable of accessing a target sample. Thedevice 700 has an outer sheath 710 having a lumen 712 into which asteerable member 720, such as a stylet, is received. The steerablemember 720 engages a top cap or knob 732 which includes a positionindicator 736 (as depicted, position indicator 736 is an arrow providedon a surface of the knob 732). Additional indicator markings can beprovided on a lip or flange 717 of the outer sheath 710, such that theposition indicator 736 is relative to one or more markings 736′, 736″ onthe flange 717, thus giving a relative direction or movement of thestylet 720 relative to the device 700 or sheath 710. In this embodiment,like the embodiment shown in FIG. 4, the steerable member 710 has aflexible curved distal tip that reforms (or returns to a curvedconfiguration) upon advancing the steerable member 710 beyond the distalend of the outer sheath 710. As will be appreciated by those skilled inthe art, markings can be provided on any of the other designs providedfor herein without departing from the scope of the invention. The styleof the position indicator(s) can also be modified, as desired. Forexample, in an indication of degrees in one or more directions could beincluded, as well as, or in addition to, the arrow markings. Additionalmarkings could be provided on the stem of, for example, the steerablemember or outer sheath, to provide additional indications of movement inan additional plane.

In an embodiment of the markings, an arrow position indicator isprovided that corresponds to, for example, a pointed tip 729 of thestylet. A thicker and thinner (top-bottom) indicator 736′, 736″ can beprovided on the flange 717 to enable the user to determine the locationof the pointed tip 729 of the stylet relative to the sheath 710. Thepointed tip can also be configured to correlate to the exterior curve ofthe stylet once the stylet is advanced beyond the end of the distal tipof the outer sheath. The knob 732 can further be configured to engagethe proximal end of the outer sheath 710 such that the position of theflexible member 720 is locked in place. For example, tongue and groove,detents and channels, or any other suitable design or configuration canbe used to engage one component with another. The implementation anddesign of the markings can be modified to incorporate human factorsconsiderations.

In operation, a user would use the position indicators 736 to determinethe orientation of the tip of the device relative to the target site.Further steering could be accomplished based on, for example,determination by reviewing an image that the device needed to beadvanced, for example, to the right 10° in order to engage the tissue.Using the position indicator(s), the user would steer the distal tip ofthe device (located within the patient) in a manner to achieve thedesired movement and advance the device toward the target site.

FIGS. 11A-G illustrate perspective and cross-sectional views of stillanother steerable device 800 capable of accessing a target sample. Thedevice 800 has an outer sheath 810 and an inner steerable member 820.The inner steerable member 820 has a further lumen 822 which engages asteerable central wire 824 having two, or more, connectable sections824′, 824″. As illustrated the steerable central wire 824 has twocomponents which are connected near a proximal end by a flexible joint826. The flexible joint 826 enables the components to be in flexiblerelationship with each other such that when the steerable member 820 isadvanced distally, bending or rotation of a proximal end of the device800 will result in steering of the distal end 804. As illustrated inFIG. 11C, the knob 832 is moved in a first direction which causes abending of the distal end of the device 800. As shown in a cross-sectiontaken perpendicular to a longitudinal axis of the device at a distalposition, the cannula portion or control wire 824 can be positionedwithin a steerable sheath 820 which, in turn, fits within the outersheath 810. In an alternative embodiment, the cannula portion 824 can befitted within one or more steering wires 825, 825′ as shown in FIG. 11B.The wires can be used to assist in the steering motion of the device byeffecting differential lengths of the wires. For example, theembodiments illustrated in FIGS. 7-8 also use wires in the steeringmechanisms. The lumen 822 into which the cannula 824 fits increases insize relative to the cross-section of the cannula 824 at a locationproximal to the cross-section taken at D-D shown in FIG. 11D. Thisrelationship is illustrated in FIG. 11E which is from a cross-sectiontaken at E-E in FIG. 11B. As shown in FIG. 11F, a first section of thecannula 824′, at its proximal end, engages a flexible material or joint826 which enables the first section of the cannula 824′ to move about anaxis relative to a second section of the cannula 824″ which engages theproximal control mechanism, or knob 832. At least a portion of thedevice 800 has a flexible sheath 810 that does not surround a cannula,as shown at the cross-section G-G depicted in FIG. 11G.

In steering the device, the operation of the device 800 is similar tothe devices described above. However, the two piece structure of thesteerable member 820 results in the proximal end of the device beingrotatable relative to the distal end of the device about the joint. Theamount of rotational movement achievable could be controlled by theflexibility of the material used at the joint. Additionally, flexibilitycould be lowered by advancing the steerable member into the outersheath, thereby positioning the joint section of the steerable memberwithin the outer sheath at a location where the flexibility of the jointis reduced.

As will be appreciated by those skilled in the art, the operation of thedevice can be such that the steerable member is positioned wholly orpartially within tissue as the device operates and engages in steeringand longitudinal movement as the device advances toward a target site.Additionally, or alternatively, the steerable member can be positionedwholly or partially within another member, such as the optional sheathor a scope, which itself is adapted to penetrate tissue, as well asengage in steering movement.

FIGS. 12A-C illustrate cross-sectional views of a variety of distal tipdesigns 900 suitable for use with any of the steerable devices shown inFIGS. 4-11. As will be appreciated, the tip designs 900 can becannulated (thus providing a lumen within the center of the tip), orform a solid needle. The distal tip can also form a cutting apparatus,or be configured to provide therapeutic or diagnostic deliverymechanisms. As shown in FIG. 12A, a two-beveled needle dual needle orcoaxial configuration is provided with a bevel core that is constrainedwithin a needle. A first needle 940 fits within a second cannulatedneedle 942. In the embodiment illustrated in FIG. 12B a four-beveledcore needle 944 is provided within a cannulated needle 942. FIG. 12Cillustrates a four-beveled core needle 944 within a cannulatedfour-beveled needle 946. Other designs and embodiments can be usedwithout departing from the scope of the invention. Further it will beappreciated that the core needle configuration can correspond to any ofthe steerable member designs described above, and the cannulated needlecan correspond to the outer sheath configurations described above.Additionally, the central core needle, in addition to being cannulated,can be configured to be removable, alone or in combination with thesheath, to allow a device to be positioned within the lumen of the outersheath. For example, a therapeutic, diagnostic or biopsy device could bepositioned within the lumen.

FIGS. 13A-F illustrate cross-sectional views of a variety of proximalcontrol mechanisms suitable for use with any of the steerable devicesshown in FIGS. 4-11, the proximal control mechanisms can be directlycontrolled by a user (such as a physician or technician), or can beengaged by another mechanism that enables the user to control thedevices from a distance (e.g., another room). Luer fittings can also beprovided at the proximal end of the device to facilitate control andengagement of various components. In the first embodiment, the outersheath 1010 (corresponding, for example, to 110, 210, 310, 410, 510,610, 710, 810, 910) engages a coiled member or spring 1034(corresponding, for example, to 134, 334, 634). The coiled member 1034provides control of the longitudinal movement 1006 along an axis of thesteerable member 1020 (corresponding, for example, to 120, 220, 320,420, 520, 620, 720, 820, 920) of the device as well as curved movement(e.g., where the coils are compressed on one side, and not the other andthe distal tip deviates away from a longitudinal axis by an angle). FIG.13B illustrates a handle 1050 which can provide additional forward andbackward 1006, side to side 1007, or rotational 1008 motion of thesteerable member 1020 relative to the outer sheath 1010. FIG. 13Cillustrates the handle of FIG. 13B in combination with a knob 1034 thatfacilitates rotational movement of the steerable member 1020. FIG. 13Dillustrates a rotational ball or tab 1035 in combination with wires of asteerable member 1020, wherein the wires are connected to the ball ortab 1035 in such a way that swiveling the ball in any direction off acentral axis results in movement of the wires within a lumen of theouter sheath 1010 and a movement of the steerable distal end 1004 of thedevice. The device of FIG. 13E illustrates the rotational ball incombination with a coiled member 1034 or spring that can provideadditional control of the longitudinal/axial movement of the device.FIG. 13F illustrates the rotational ball in combination with a knob 1034which provides additional rotational control of the device. Theembodiments employing a ball or tab 1035 facilitate single-handedsteering and control of the device, as discussed above.

FIGS. 14A-B illustrate mechanisms for remote control of the steerabledevices shown in FIGS. 4-11. The configuration allows for real-time ornear real-time guidance of the distal tip. An actuation lever 1112 isconnected to a linkage within a handle 1116. The linkage within thehandle 1116 communicates with an actuator that is connected to steerablemember 1110. This enables control of the devices described above withoutthe interventionalist (such as x-ray technician or physician) being incontact with the exterior of a patient's body during the assessment ofwhere the device is positioned to access the target site. As a resultthe steering action for the device can be performed remotely from theneedle site entry. Thus, by separating the position of the user's handfrom the needle entry site, a CT-scan can be performed while operatingthe steerable device without radiation exposure to the user's hands, asshown in FIG. 16. In another embodiment, shown in FIG. 14B, a mechanismis provided for full gambling control remote from the radiation. A thumbknob 1132 is provided in the handle that allows a forward and backcontrol of the steerable device. Additionally, a side to side movementand rotation is enabled as well, and combinations thereof, to optimizethe movement of the distal end of the steerable device.

FIGS. 15A-B illustrate additional mechanisms for control of thesteerable devices shown in FIGS. 4-11. In the embodiment shown in FIG.15A, finger rings 1202, 1202′ connected to control wires 1204, 1204′that pass through a passage formed in the proximal end of steerabledevice 1200. A hinge 1206 then attaches to a pivoting connection to aself-aligning bearing or ball gimbal 1208. The ball gimbal providesrotational freedom about two perpendicular axes. The second control wireextends from ring 1202′ to a fixed connection on ball gimbal 1208. Ballgimbal 1208 is connected to control wires (not shown) as part of asteering mechanism for steerable device 1200 as described above. Thedistal end of the steerable device 1200 may be moved steered by movingrings 1202, 1202′. Steerable device 1200 may be advanced into thepatient toward a suspected lesion by moving ring 1202 down toward ring1202′. The entire apparatus may be attached to the patient's body by anysuitable mechanism, including, for example, adhesive. The systemillustrated in FIG. 15B illustrates a remote control apparatus 1240 thatcommunicates with the steerable device 1200 using a joy stick 1242 thatrotates around a pivot so that the distal point moves across a surface.The joy stick 1242 is connected to a linkage 1244 that can move to theleft and right, as well as forward and back using push/pull controlwires, thereby bending the steerable needle.

FIG. 16 illustrates an interventionalist 56, e.g. physician ortechnician, controlling the steerable devices shown in FIGS. 4-11 toaccess target site on a patient 52 using, for example, remote accessdevices shown in FIGS. 14 and 15. As will be appreciated by thoseskilled in the art, the remote access and control can be from a positionthat is in another room (as illustrated in FIG. 3), or from any suitablelocation, such as those that minimizes exposure to the image capturemachine. Additionally, remote control wireless devices and mechanismscan be used by the interventionalist 56 to control the active steeringand movement of the device. See, for example, U.S. Pat. No. 6,768,425entitled Medical Apparatus Remote Control and Method (Flaherty et al.);and U.S. Pat. No. 6,577,893 entitled Wireless Medical Diagnosis andMonitoring Equipment (Besson et al.).

FIG. 17 illustrates a cross-sectional view of a steerable device used asa biopsy device to capture a target sample at its distal end. In thisembodiment, the outer sheath 1310 surrounds a steerable member 1320which has a distal end configured to capture tissue 82. The steerableproximal end, uses a spring 1334 to control axial movement and a knob1335 to control steering and bending of the distal end 1304 of thedevice. Modifications to the capture design of the distal end tofacilitate collection of cells or fluid can also be made withoutdeparting from the scope of the invention.

FIGS. 18A-C illustrate a variety of systems that can be incorporated inconfiguration and use of the device described above. For example, amechanism for controlling temperature sensing and delivery of heat orcold, as illustrated in FIG. 18A can be provided. An energy source 1360is provided that communicates with an energy delivery source 1362. Theenergy delivery source 1362 can deliver heat and/or cold. A sensor 1364can also be provided to provide a loop to the system that controlsapplication of further heat and/or cold. In another embodiment, theenergy delivery source 1362 and sensor 1364 can be provided with asystem for delivering pressurized gas 1370 as illustrated in FIG. 18B.In yet another system, such as that illustrated in FIG. 18C, a powersupply 1360 can be provided that delivers RF energy to the distal tip ofthe device 1300, which results in cutting or cauterization of tissue anddelivery of RF for cutting and coagulation. Any of these systems can beused in connection with any of the steerable devices shown in FIGS.4-11.

Suitable materials for making the devices, and any component part of thedevices, including those discussed above and disclosed herein, would beapparent to those skilled in the art. Suitable materials includebiocompatible materials such as inorganic materials (metals, ceramics,and glasses) and polymeric materials (synthetic and natural). Thus, forexample, stainless steel, shape memory alloys (such as nickel-titaniumalloys) would be suitable for use in the device. Additionally, suitablepolymeric materials can be selected from a wide variety of knownbiocompatible and biodegradable polymers, such as those classified aspolystyrenes, polyphosphoester, polyphosphazenes, aliphatic polyestersand their copolymers, such as polycaprolactone, hydroxybutyric acid, andbutylenes succinate. Other polyesters, such as nylon, and naturalpolymers, such as modified polysaccharides, may also be appropriate,depending upon the application. In some instances, it may be desirableto use a shape memory polymer that has the ability to store and recordlarge strains. Still other polymers include polyetheretherketone,polyetherketoneketone, polyethylene, fluoropolymers, elastomers and thelike.

Other appropriate polymers that can be used in the components or devicesare described in the following documents, all of which are incorporatedherein by reference: PCT Publication WO 02/02158 A1, dated Jan. 10, 2002and entitled Bio-Compatible Polymeric Materials; PCT Publication WO02/00275 A1, dated Jan. 3, 2002 and entitled Bio-Compatible PolymericMaterials; and PCT Publication WO 02/00270 A1, dated Jan. 3, 2002 andentitled Bio-Compatible Polymeric Materials. Still other materials suchas Bionate®, polycarbonate urethane, available from the PolymerTechnology Group, Berkeley, Calif., may also be appropriate because ofthe good oxidative stability, biocompatibility, mechanical strength andabrasion resistance. Combinations of any suitable material, includingthe materials listed here, can be used as well, without departing fromthe scope of the invention.

FIG. 19 illustrates a target lung 20, of lungs 19, having a steerabledevice 1600 positioned to access a target site 82. The device 1600 hasbeen steered away from a first trajectory (the device shown in phantom)1601, using the steering capabilities described above. As a result thesteerable device 1600 engages the target site 82, whereupon any of thediagnostic, therapeutic, and marking procedures described above can beachieved using the steering device. The fact that the device 1600creates its own path, which is steerable and correctable actively whileadvancing the device toward the target site, enables the device to beadvanced to the target site without the need to repeatedly withdraw andre-advance the device. In the context of the lung, this simplifiedmethod decreases the likelihood that a pneumothorax will result.

For purposes of illustrating the use of the devices disclosed hereinwith a scope, FIG. 20 illustrates a flexible bronchoscope 90 with aworking channel into which a steerable device 1500 has been inserted.The steerable device 1500 has been illustrated in a curved orientationwhich would result during operation using the devices and methodsdiscussed above. As will be appreciated by those skilled in the art,prior to inserting the bronchoscope 90 into a patient, an accessaccessory, such as a guide wire (not shown) can be inserted into thedistal end of the scope. The guide wire can then be bent around thescope end so that the guidewire lies outside the scope along the lengthof the scope. When the bronchoscope is inserted into a patient's lungs,the proximal end of the guidewire remains outside the patient. Theguidewire can, however, be used to deliver diagnostic, therapy, orbiopsy tools to the distal end of the bronchoscope without having topass the tools through the working channel. These tools can be deliveredeither simultaneously alongside the bronchoscope or after thebronchoscope has been placed at the selected site within the patient'slung.

FIG. 21 illustrates the steps of a method for operating and deployingthe devices described herein. In a first step target site is identified1400 in a patient. Once the target site is identified 1400, a steerabledevice is introduced 1402. The introduction of the steerable device1402, is typically at a location that provides the most direct,unimpeded access to tissue. However, as will be appreciated by thoseskilled in the art, due to anatomical obstacles, the path may notnecessarily present the shortest distance to the target site. Movementof the access point to a different location, which has a longer path tothe target site, may be employed if desirable. For example, where densetissue, or bones would impede the ability of the steerable device toreach its projected location, steering would be required.

Once the tissue has been identified and the steerable device has beenintroduced, the device is advanced toward the target site 1404. Asdiscussed above, the entire device can be advanced (for example, theouter sheath and the steerable member) or just a component can beadvanced. At some point while advancing the to the target site, it maybe desirable to stop advancing the device, or to assess the location ofthe distal tip of the device relative to the target site 1406. Theassessment can be done by obtaining a series of images, or as technologycontinues to develop by assessing the location and steering of thedevice relative to the target site real time, or near real time usingavailable imaging techniques. Once the location of the distal tip of thesteerable device is assessed, the configuration of the distal end of thesteerable device can be configured 1408 to direct the steerable deviceto the target site (e.g. where the trajectory of the steerable device nolonger intersects with the location of the target site). The steerabledevice is advanced to the target 1410, either with adjustment of thedistal tip, or without, as desired.

Once the distal tip of the steerable device is positioned at the targetsite, the user can remove the steerable core (where a removablesteerable core is provided) 1420 and replace the core with a tissueremoval device 1422, a therapy delivery or location marking device 1424,or a diagnostic assessment device 1426 or introduce or extract energy toheat or freeze the target site 1428 or use a device as a guide toadvance or deliver additional device to the target site 1430. As will beappreciated by those skilled in the art, each of the processesillustrated can be repeated (as indicated by the circular arrow path)and combinations of the steps can be practiced during a single sessionwith a patient without departing from the scope of the invention.Steering mechanisms may be incorporated in therapy, treatment,diagnostic or• marking devices.

The steerable device can be used in combination with a number of devicesto deliver therapy and/or diagnostics. See, for example, U.S. Pat. No.6,945,942 entitled Device for Biopsy and Treatment of Breast Tumors (VanBladel et al.); U.S. Pat. No. 6,789,545 entitled Method and System forCryoablating Fibrodenomas (Littrup et al.); U.S. Pat. No. 6,551,255entitled Device for Biopsy of Tumors (Van Bladel et al.); U.S. Pat. No.5,916,212 entitled Hand Held Cryosurgical Probe System (Baust et al.);U.S. Pat. No. 5,846,235 entitled Endoscopic Cryospray Device (Pasrichaet al.); U.S. Pat. No. 5,514,536 entitled Solutions for TissuePreservation and Bloodless Surgery and Methods Using Same (Taylor); U.S.Pat. No. 5,978,697 entitled System and Method for MRI-Guided Cryosurgery(Ma al et al.); U.S. Pat. No. 6,875,209 entitled Cryoplasty Apparatusand Method (Zvuloni et al.); U.S. Pat. No. 6,962,587 entitled Method forDetecting and Treating Tumors Using Localized Impedance Measurement(Johnson et al.); U.S. Pat. No. 6,663,624 entitled RF TreatmentApparatus (Edwards et al.); U.S. Pat. No. 6,652,516 entitled CellNecrosis Apparatus (Gough); U.S. Pat. No. 6,632,222 entitled TissueAblation Apparatus (Edwards et al.); U.S. Pat. No. 5,334,183 entitledEndoscopic Electrosurgical Apparatus (Wuchinich); U.S. Pat. No.5,312,329 entitled Piezo Ultrasonic and Electrosurgical Handpiece (Beatyet al.); U.S. Pat. No. 6,752,767 entitled Localization Element with.Energized Tip (Turovskiy et al.); U.S. Pat. No. 6,652,520 entitledModular Biopsy and Microwave Ablation Needle Delivery Apparatus Adaptedto In Situ Assembly and Method of Use (Moorman et al.); U.S. Pat. No.6,807,446 entitled Monopole Phased Array Thermotherapy Applicator forDeep Tumor Therapy (Penn et al.); U.S. Pat. No. 6,690,976 entitledThermotherapy Method for Treatment and Prevention of Breast Cancer andCancer in Other Organs (Penn et al.); U.S. Pat. No. 6,537,195 entitledCombination X-Ray Radiation and Drug Delivery Devices and Methods forInhibiting Hyperplasia; U.S. Pat. No. 6,390,967 entitled Radiation forInhibiting Hyperplasia After Intravascular Interfention (Forman et al.);U.S. Pat. No. 6,840,948 entitled Device for Removal of Tissue Lesions(Albrecht et al.); U.S. Pat. No. 6,942,627 entitled Surgical BiopsyDevice Having a Flexible Cutter (Huitema); U.S. Pat. No. 6,758,824entitled Biopsy Apparatus (Miller et al.); U.S. Pat. No. 6,312,428entitled Methods and Apparatus for Therapeutic Cauterization ofPredetermined Volumes of Biological Tissue (Eggers et al.); U.S. Pat.No. 6,287,304 entitled Interstitial Cautherization of Tissue Volumeswith Electrosurgically Deployed Electrodes (Eggers et al.); U.S. Pat.No. 6,936,014 entitled Devices and Methods for Performing Procedures ona Breast (Vetter et al.); U.S. Pat. No. 6,863,676 entitled ExcisionalBiopsy Devices and Methods (Lee et al.); and U.S. Pat. No. 4,479,792entitled Peritoneal Fluid Treatment Apparatus, Package and Method(Lazarus et al.).

Other devices that can be modified to incorporate the designs andobjectives of the invention include steerable needle, lancet, trocar,stylet, cannula, device and/or system. See, U.S. Pat. No. 4,013,080entitled Cannula Connector and Director Indicator Means for InjectionSystem (Froning); U.S. Pat. No. 4,769,017 entitled Self-Sealing InfusionManifold and Catheter Connector (Path et al); U.S. Pat. No. 5,240,011entitled Motorized Biopsy Needle Positioner (Assa); U.S. Pat. No.5,526,821 entitled Biopsy Needle with Sample Retaining Means (Jamshidi);U.S. Pat. No. 5,660,185 entitled Image-Guided Biopsy Apparatus withEnhanced Imaging and Methods (Shmulewitz); U.S. Pat. No. 5,735,264entitled Motorized Mammographic Biopsy Apparatus (Siczek et al); U.S.Pat. No. 6,315,737 B1 entitled Biopsy Needle for a Biopsy Instrument(Skinner); U.S. Pat. No. 6,328,701 B1 entitled Biopsy Needle andSurgical Instrument (Terwilliger); U.S. Pat. No. 6,402,701 B1 entitledBiopsy Needle Instrument (Kaplan); U.S. Pat. No. 6,464,648 B1 entitledBiopsy Device and Remote Control Device Therefor (Nakamura); U.S. Pat.No. 6,485,436 B1 entitled Pressure-Assisted Biopsy Needle Apparatus andTechnique (Truckai et al); U.S. Pat. No. 6,558,337 B2 entitledPositioner for Medical Devices such as Biopsy Needles (Dvorak et al);U.S. Pat. No. 6,709,408 B2 entitled Dual Action Aspiration Biopsy Needle(Fisher); U.S. Pat. No. 6,908,440 B2 entitled Dual Action AspirationBiopsy Needle (Fisher); and U.S. Pat. No. 6,918,881 B2 entitled BiopsyNeedle with Integrated Guide Pin (Miller et al). U.S. PatentPublications US 2004/0133168 A1 entitled Steerable Needle (Salcudean etal.); as well as PCT Publications WO 00/13592 A1 entitled Device forReceiving and Actuating a Biopsy Needle (Heinrich); WO 03/077768 A1entitled Biopsy Needle and Biopsy Needle Module that Can be Insertedinto the Biopsy Device (Heske et al); WO 2004/062505 A1 entitledFlexible Biopsy Needle (Bates et al.); and WO 2004/086977 A1 entitledCoaxial Cannula Provided with a Sealing Element (Heske et al.).

In addition to the use of scopes to introduce the steerable needles,lancets, trocars, stylets, cannulas, devices and/or systems of theinvention, a variety of other techniques are also suitable for insertingthe steerable devices of the invention into a patient. One such suitabletechnique is the Seldinger technique, developed by the Swedishradiologist Sven-Ivar Seldinger to provide a method for percutaneouspuncture and catheterization of the arterial system. The Seldingertechnique employs the use of a thin walled percutaneous device, such asa needle, to access a patient. A guidewire is passed through the lumenof the needle. The guidewire is advanced into the tissue (beyond thedistal end of the needle) and the needle is withdrawn. At that point,the puncture site (where the needle and guidewire entered the patient)can be enlarged, if desired. An outer sheath (such as those describedabove) is then advanced over the guidewire toward the target site. Afterthe outer sheath is positioned, the guidewire is removed and thesteerable member is inserted. Thereafter the entire system can beadvanced toward the target site directly or employing any of thesteering mechanisms described above. This technique, and modificationsthat take into consideration the device and systems designs of thisinvention, can also be employed.

An additional application of the device includes the accurate deliveryof materials to a target site. Materials includes: therapeutic anddiagnostic substances, in liquid, solid, or any other form. For example,agents suitable for chemical pleurodesis, including radioactiveisotopes, tetracycline, chemotherapeutic agents, and talc can bedelivered using the devices and techniques of the invention.

In another application of the device and methods, accurate delivery ofmaterials to a target site, includes the delivery of adhesive materials,such as those having strength values up to 1.5 psi, or more; preferablyhaving a strength value between 0.2-0.6 psi. In addition, the adhesivematerial suitable for any of the embodiments of the methods of theinvention have viscosity levels of 1.1 centipoise and higher. Further,materials suitable for performing any of the methods of the inventioncan be selected from the group comprising hydrogels, proteins, polymersand cross-linking agents. The hydrogel adhesive may include materialselected from the group consisting of hyalurons, hyaluronic acid,alginates, chitins, chitosans, and derivatives thereof. The proteinmaterial comprises material that can be selected from the groupconsisting of albumins, porcine albumin, collagens and gelatins. Thepolymer material comprises material selected from the group consistingof poly(lactic acid) and poly(glycolide). The cross-linking agentmaterial comprises material that may be selected from the groupconsisting of glutaraldehyde and stable polyaldehyde. For example,adhesive material could be delivered to a target site and allowed tocure at the location of a small lesion. The curing of the material wouldprovide in situ a lump of material having a consistency different fromnatural tissue that a surgeon could then use to determine the locationof the target lesion. Determination of the location of the materialcould be determined by palpation. In another embodiment, an inner membercould surround the tissue and a polymerizing adhesive material could beextruded from between an outer member and the inner member, theextrusion could be performed as the device were drawn out, therebyforming a sheath around the target site and encapsulating it. Theencapsulated tissue, now prevented from obtaining nourishment from bloodflow, would then become necrotic and could be removed in a subsequentprocedure. For example, where a patient is undergoing chemotherapy andhas a compromised immune system, it may be desirable to encapsulatetarget lesions and then, after the patient has recovered from thechemotherapy, remove the encapsulated lesions.

Although many alternative sealant formulations may be suitable for thepurposes described herein, a preferred sealant would consist ofprimarily a combination of stable polyaldehyde, albumin and collagenwith or without additional additives. The sealant can also have agentsthat initiate or accelerate the clotting cascade so the sealant can beused as a hemostatic agent. For example, a suitable material isdescribed in US Patent Application Publ. No. 2004/0081676. The glue'sintrinsic viscosity can be tuned to allow for fast or slow deliverythrough a delivery system and includes glue viscosity more than 1.1centipoise. This glue formulation is appropriate for use with all lungtissue and structures within the pulmonary system as well as pulmonaryvasculature. It can also be formulated and used for any adhesive oranti-adhesion purpose including anastomosis of blood vessels andbronchi/bronchioles and to seal pulmonary structures from air leaks,bleeding or fluid leaks. Ideally, the sealant will cure within a fewminutes, works well in a damp or wet environment, and blocks air orfluid from entering the pleural cavity. Typically, the glues arecomposed of a condensation product of glutaraldehyde that consists ofcross-linked albumin, including porcine albumin. Adhesion values for theglue can be up to 1.5 psi, more preferably between 0.2-0.6 psi. Agentscan be included in the adhesives that absorb x-rays to enhance theability to visualize the target site.

Still another application of the device and methods provides for theaccurate delivery of therapeutic materials, such as chemotherapy agents,and biologically active agents, to a target site. Yet anotherapplication of the device and methods provides for the accurate deliveryof therapeutic materials, such as chemotherapy agents, and biologicallyactive agents, to a target site using a delivery medium. For example,therapeutic materials can be incorporated into a material beingdelivered, such as glue. The therapeutic material can be incorporatedinto the material to provide time-released delivery of the therapeuticmaterial.

Yet another application of the device and method provides for theaccurate delivery using a steerable device of bioabsorbable materials ordrug delivery materials (e.g. a drug eluting delivery device). Forexample, it may be desirable to deliver all, or a part of the materialto be delivered in bioresorbable polymers. Bioresorbable materials arethose materials made from essentially the same lactic acid molecularbuilding blocks that occur naturally in the human body. Long polymerchains are created to form polylactides (PLa). Thus for example, abiologically and biomechanically active PLa can be delivered using thesteerable device which is then resorbed during the healing process.

In still other embodiments, biocompatible polymers, biocompatible foams,such thermoplastic syntactic foam, water-insoluble derivatives ofhyaluronic acid in the form of gels, films and sponges, polyglycolicacid, low-density reticulated vitreous carbon (RVC), and hydrogels canbe delivered using the steerable devices of the invention. The materialsdelivered can be prepared in colored form by including a dye or stain toassist in easier handling and visualization during or after the process.The materials delivered can also be selected for its ability to becomemore or less viscous as the material approaches body temperature, or toprovide growth factors, antibiotics, or other agents to the site.Materials may also be loaded with pharmaceutical agents which aredelivered to the site by a permeable or semi-permeable membrane.

Kits employing the devices; components and materials of the inventioncan also be employed.

While preferred embodiments of the present invention have been shown anddescribed herein, it will be obvious to those skilled in the art thatsuch embodiments are provided by way of example only. Numerousvariations, changes, and substitutions will now occur to those skilledin the art without departing from the invention. It should be understoodthat various alternatives to the embodiments of the invention describedherein may be employed in practicing the invention. It is intended thatthe following claims define the scope of the invention and that methodsand structures within the scope of these claims and their equivalents becovered thereby.

What is claimed is:
 1. A method of delivering a device to a target sitein a patient comprising: introducing a steerable member through a scope;and applying a bending force to bend the steerable member to deliver thedevice to the target site.
 2. A method of delivering a steerable-deviceto a target site in a patient comprising: removably coupling a steeringmechanism axially within a lumen of a steerable member; penetratingtissue with the steerable member, the member having a proximal end and asharp distal end with a longitudinal length therebetween, the distal endhaving a closed sharpened tip to penetrate the tissue and form a paththrough the tissue; wherein the steerable member defines an axialtrajectory along the direction of the longitudinal length and extendingdistally from the distal end; applying a bending force to a bendableportion of the steering mechanism to form the path through the tissueafter penetrating the tissue to bend the steerable member along the paththrough the tissue, wherein the bending force imposes a curvature in thesteerable member between the proximal end and the distal end to reorientthe path; and advancing the longitudinal length of the steerable memberand the steering mechanism distally into the tissue along the path suchthat subsequent distal tissue penetrating advancement of the axiallycoupled steerable member and steering mechanism together within thetissue angles the path away from the trajectory suitably to deliver thedevice to the target site.
 3. The method of claim 2, further comprising:positioning a port along the longitudinal length of the steerable memberand extending between an outer surface of the steerable member and thelumen of the steerable member.
 4. The method of claim 2, furthercomprising: positioning an outer sheath to removably receive thesteerable member therein, the sheath having a distal end disposed nearthe distal end of the steerable member; and advancing the sheath throughthe tissue with the steerable member when the steerable member isreceived in a lumen of the sheath.
 5. The method of claim 4, furthercomprising: advancing the steerable member longitudinally past thedistal end of the outer sheath, wherein a distal end of the sheath lumencurves away from the axial trajectory of the steerable member and thesteerable member bends away from the axial trajectory duringadvancement.
 6. The method of claim 4, wherein the steerable memberrotates 360 degrees about a longitudinal axis of the steerable device.7. The method of claim 4, further comprising: providing at least oneposition indicator on the proximal end of the steerable member or on aproximal end of the outer sheath.
 8. The method of claim 4, furthercomprising: providing at least one position indicator on the proximalend of the steerable member and on a proximal end of the outer sheath.9. The method of claim 2, wherein the steering mechanism comprises atleast one pull wire.
 10. The method of claim 2, wherein applying thebending force to the steering mechanism alters a location andorientation of the distal end within the tissue and distally advancingthe steerable member within the tissue angles way from the trajectoryand toward the target site.
 11. The method of claim 2, wherein thedistal tissue penetrating end of the steerable member comprises a curvedshape which deviates away from a longitudinal axis of the steerabledevice.
 12. The method of claim 2, further comprising at least one ofthe following steps of: using the steerable member to advance anotherdevice to the target site; removing tissue at the target site; drainingthe target site; infusing the target site with a therapeutic ordiagnostic agent; delivering energy to the target site; extracting heatenergy from the target site; and killing tissue at the target site. 13.The method of claim 2, further comprising: assessing a location of thelongitudinal length of the steerable member and the steering mechanismrelative to the target site after the tissue has been penetrated. 14.The method of claim 13, further comprising: adjusting the advancement ofthe longitudinal length of the steerable member and the steeringmechanism distally into the tissue along the path based on the locationassessment.